Validate geometry after solving

web/app/canvas.js

@@ -76,6 +76,18 @@ TCAD.TWO.Viewer = function(canvas) {
   this.refresh();
 };
 
+TCAD.TWO.Viewer.prototype.validateGeom = function() {
+  for (var i = 0; i < this.layers.length; i++) {
+    var objs = this.layers[i].objects;
+    for (var j = 0; j < objs.length; j++) {
+      if (!objs[j].validate()) {
+        return false;        
+      }
+    }
+  }
+  return true;
+};
+
 TCAD.TWO.Viewer.prototype.addSegment = function(x1, y1, x2, y2, layer) {
   var a = new TCAD.TWO.EndPoint(x1, y1);
   var b = new TCAD.TWO.EndPoint(x2, y2);
@@ -339,6 +351,11 @@ TCAD.TWO.SketchObject.prototype.visit = function(onlyVisible, h) {
   return h(this);
 };
 
+TCAD.TWO.SketchObject.prototype.validate = function() {
+  return true;
+};
+
+
 TCAD.TWO.SketchObject.prototype.getDefaultTool = function(viewer) {
   return new TCAD.TWO.DragTool(this, viewer);
 };
@@ -446,6 +463,10 @@ TCAD.TWO.utils.extend(TCAD.TWO.Segment, TCAD.TWO.SketchObject);
 
 TCAD.TWO.Segment.prototype._class = 'TCAD.TWO.Segment';
 
+TCAD.TWO.Segment.prototype.validate = function() {
+  return TCAD.math.distanceAB(this.a, this.b) > TCAD.TOLERANCE;
+};
+
 TCAD.TWO.Segment.prototype.collectParams = function(params) {
   this.a.collectParams(params);
   this.b.collectParams(params);

web/app/parametric.js

@@ -354,24 +354,34 @@ TCAD.TWO.ParametricManager.prototype.prepare = function(locked, alg) {
     }
     solver.solveSystem(fineLevel);
   }
-  
+  var viewer = this.viewer;
   function sync() {
+    var rollback = [];
     for (p in pdict) {
       _p = pdict[p];
+      rollback.push([_p._backingParam, _p._backingParam.get()]);
       _p._backingParam.set(_p.get());
     }
 
     //Make sure all coincident constraints are equal
-
+    var rollbackCo = [];
     for (ei = 0; ei < equalsIndex.length; ++ei) {
       var master = equalsDict[ equalsIndex[ei][0]];
       for (i = 1; i < equalsIndex[ei].length; ++i) {
         var slave = equalsDict[equalsIndex[ei][i]];
+        rollbackCo.push([slave.id, slave.get()]); 
         slave.set(master.get());
       }
     }
-
-
+    
+    if (false && !viewer.validateGeom()) { //Disabled
+      for (i = 0; i < rollback.length; ++i) {
+        rollback[i][0].set(rollback[i][0]);
+      }
+      for (i = 0; i < rollbackCo.length; ++i) {
+        rollbackCo[i][0].set(rollbackCo[i][0]);
+      }
+    }
   }
   
   solver.solve = solve;